Method for testing and identifying underwater sound noise based on small wave area

Abstract

The hydroacoustic noise detecting and distinguishing method based on wavelet domain includes the first mean value-eliminating and amplitude normalizing treatment of ship noise and marine environment noise, and the subsequent multiple scale domain decomposing of the wavelet domain and establishing implicit wavelet domain Markov model. Based on the characteristic difference between marine environment noise model and ship radiation noise model, one detection method based on Nyman-Pearson criterion is proposed. The likelihood value between the ship noise and the marine environment noise HMT model is used as the inspection statistic for binary hypothesis inspection to raise the ship noise detecting capacity. One characteristic vector describing the detection sample is formed for judging ship noise type, resulting in raised identification rate and robustness.

Description

technical field [0001] The invention relates to a detection and identification method of underwater acoustic noise based on wavelet domain (underwater acoustic noise is divided into ship noise and marine environment noise), relates to the fields of non-stationary signal processing, pattern recognition and data mining, and can be directly applied to the navy Target detection and recognition of weapons and equipment. Background technique [0002] Underwater acoustic technology is a method and technology that uses sound waves to detect, locate, track, identify, underwater communication, and navigation targets in water, on the seabed, and below the seabed. The sinking of the giant passenger ship "Titanic" in 1912 promoted the birth of modern underwater acoustic technology. In World War I, echolocation sonar appeared. During World War II, underwater acoustic technology developed greatly, sonar equipment was improved, and acoustic guidance torpedoes and acoustic mines appeared. ...

AI Technical Summary

Problems solved by technology

For the former modeling method, in reality, due to the complex structure of the hull itself, there are many sound sources causing noise, and the propagation channel cannot be accurately modeled, so it is almost impossible to establish an accurate mechanism model , and is not universal

The latter is to model ship noise from the perspective of statistical analysis, but the practicability of the model is poor, and the detection of ship noise in the background of the marine environment cannot be realized, and the amount of calculation is large, so it cannot be truly practical

Although these statistical methods involve the non-Gaussian nature of ship noise, they do not really model the non-Gaussian nature of ship noise, and cannot well describe and explain the reasons why ships produce different noises under different working conditions

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